drivers/isdn/gigaset/common.c

   1 /*
   2  * Stuff used by all variants of the driver
   3  *
   4  * Copyright (c) 2001 by Stefan Eilers,
   5  *                       Hansjoerg Lipp <hjlipp@web.de>,
   6  *                       Tilman Schmidt <tilman@imap.cc>.
   7  *
   8  * =====================================================================
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License as
  11  *      published by the Free Software Foundation; either version 2 of
  12  *      the License, or (at your option) any later version.
  13  * =====================================================================
  14  */
  15
  16 #include "gigaset.h"
  17 #include <linux/ctype.h>
  18 #include <linux/module.h>
  19 #include <linux/moduleparam.h>
  20
  21 /* Version Information */
  22 #define DRIVER_AUTHOR "Hansjoerg Lipp <hjlipp@web.de>, Tilman Schmidt <tilman@imap.cc>, Stefan Eilers"
  23 #define DRIVER_DESC "Driver for Gigaset 307x"
  24
  25 /* Module parameters */
  26 int gigaset_debuglevel = DEBUG_DEFAULT;
  27 EXPORT_SYMBOL_GPL(gigaset_debuglevel);
  28 module_param_named(debug, gigaset_debuglevel, int, S_IRUGO|S_IWUSR);
  29 MODULE_PARM_DESC(debug, "debug level");
  30
  31 /* driver state flags */
  32 #define VALID_MINOR     0x01
  33 #define VALID_ID        0x02
  34 #define ASSIGNED        0x04
  35
  36 void gigaset_dbg_buffer(enum debuglevel level, const unsigned char *msg,
  37                         size_t len, const unsigned char *buf)
  38 {
  39         unsigned char outbuf[80];
  40         unsigned char c;
  41         size_t space = sizeof outbuf - 1;
  42         unsigned char *out = outbuf;
  43         size_t numin = len;
  44
  45         while (numin--) {
  46                 c = *buf++;
  47                 if (c == '~' || c == '^' || c == '\\') {
  48                         if (!space--)
  49                                 break;
  50                         *out++ = '\\';
  51                 }
  52                 if (c & 0x80) {
  53                         if (!space--)
  54                                 break;
  55                         *out++ = '~';
  56                         c ^= 0x80;
  57                 }
  58                 if (c < 0x20 || c == 0x7f) {
  59                         if (!space--)
  60                                 break;
  61                         *out++ = '^';
  62                         c ^= 0x40;
  63                 }
  64                 if (!space--)
  65                         break;
  66                 *out++ = c;
  67         }
  68         *out = 0;
  69
  70         gig_dbg(level, "%s (%u bytes): %s", msg, (unsigned) len, outbuf);
  71 }
  72 EXPORT_SYMBOL_GPL(gigaset_dbg_buffer);
  73
  74 static int setflags(struct cardstate *cs, unsigned flags, unsigned delay)
  75 {
  76         int r;
  77
  78         r = cs->ops->set_modem_ctrl(cs, cs->control_state, flags);
  79         cs->control_state = flags;
  80         if (r < 0)
  81                 return r;
  82
  83         if (delay) {
  84                 set_current_state(TASK_INTERRUPTIBLE);
  85                 schedule_timeout(delay * HZ / 1000);
  86         }
  87
  88         return 0;
  89 }
  90
  91 int gigaset_enterconfigmode(struct cardstate *cs)
  92 {
  93         int i, r;
  94
  95         cs->control_state = TIOCM_RTS; //FIXME
  96
  97         r = setflags(cs, TIOCM_DTR, 200);
  98         if (r < 0)
  99                 goto error;
 100         r = setflags(cs, 0, 200);
 101         if (r < 0)
 102                 goto error;
 103         for (i = 0; i < 5; ++i) {
 104                 r = setflags(cs, TIOCM_RTS, 100);
 105                 if (r < 0)
 106                         goto error;
 107                 r = setflags(cs, 0, 100);
 108                 if (r < 0)
 109                         goto error;
 110         }
 111         r = setflags(cs, TIOCM_RTS|TIOCM_DTR, 800);
 112         if (r < 0)
 113                 goto error;
 114
 115         return 0;
 116
 117 error:
 118         dev_err(cs->dev, "error %d on setuartbits\n", -r);
 119         cs->control_state = TIOCM_RTS|TIOCM_DTR; // FIXME is this a good value?
 120         cs->ops->set_modem_ctrl(cs, 0, TIOCM_RTS|TIOCM_DTR);
 121
 122         return -1; //r
 123 }
 124
 125 static int test_timeout(struct at_state_t *at_state)
 126 {
 127         if (!at_state->timer_expires)
 128                 return 0;
 129
 130         if (--at_state->timer_expires) {
 131                 gig_dbg(DEBUG_MCMD, "decreased timer of %p to %lu",
 132                         at_state, at_state->timer_expires);
 133                 return 0;
 134         }
 135
 136         if (!gigaset_add_event(at_state->cs, at_state, EV_TIMEOUT, NULL,
 137                                at_state->timer_index, NULL)) {
 138                 //FIXME what should we do?
 139         }
 140
 141         return 1;
 142 }
 143
 144 static void timer_tick(unsigned long data)
 145 {
 146         struct cardstate *cs = (struct cardstate *) data;
 147         unsigned long flags;
 148         unsigned channel;
 149         struct at_state_t *at_state;
 150         int timeout = 0;
 151
 152         spin_lock_irqsave(&cs->lock, flags);
 153
 154         for (channel = 0; channel < cs->channels; ++channel)
 155                 if (test_timeout(&cs->bcs[channel].at_state))
 156                         timeout = 1;
 157
 158         if (test_timeout(&cs->at_state))
 159                 timeout = 1;
 160
 161         list_for_each_entry(at_state, &cs->temp_at_states, list)
 162                 if (test_timeout(at_state))
 163                         timeout = 1;
 164
 165         if (cs->running) {
 166                 mod_timer(&cs->timer, jiffies + msecs_to_jiffies(GIG_TICK));
 167                 if (timeout) {
 168                         gig_dbg(DEBUG_CMD, "scheduling timeout");
 169                         tasklet_schedule(&cs->event_tasklet);
 170                 }
 171         }
 172
 173         spin_unlock_irqrestore(&cs->lock, flags);
 174 }
 175
 176 int gigaset_get_channel(struct bc_state *bcs)
 177 {
 178         unsigned long flags;
 179
 180         spin_lock_irqsave(&bcs->cs->lock, flags);
 181         if (bcs->use_count) {
 182                 gig_dbg(DEBUG_ANY, "could not allocate channel %d",
 183                         bcs->channel);
 184                 spin_unlock_irqrestore(&bcs->cs->lock, flags);
 185                 return 0;
 186         }
 187         ++bcs->use_count;
 188         bcs->busy = 1;
 189         gig_dbg(DEBUG_ANY, "allocated channel %d", bcs->channel);
 190         spin_unlock_irqrestore(&bcs->cs->lock, flags);
 191         return 1;
 192 }
 193
 194 void gigaset_free_channel(struct bc_state *bcs)
 195 {
 196         unsigned long flags;
 197
 198         spin_lock_irqsave(&bcs->cs->lock, flags);
 199         if (!bcs->busy) {
 200                 gig_dbg(DEBUG_ANY, "could not free channel %d", bcs->channel);
 201                 spin_unlock_irqrestore(&bcs->cs->lock, flags);
 202                 return;
 203         }
 204         --bcs->use_count;
 205         bcs->busy = 0;
 206         gig_dbg(DEBUG_ANY, "freed channel %d", bcs->channel);
 207         spin_unlock_irqrestore(&bcs->cs->lock, flags);
 208 }
 209
 210 int gigaset_get_channels(struct cardstate *cs)
 211 {
 212         unsigned long flags;
 213         int i;
 214
 215         spin_lock_irqsave(&cs->lock, flags);
 216         for (i = 0; i < cs->channels; ++i)
 217                 if (cs->bcs[i].use_count) {
 218                         spin_unlock_irqrestore(&cs->lock, flags);
 219                         gig_dbg(DEBUG_ANY, "could not allocate all channels");
 220                         return 0;
 221                 }
 222         for (i = 0; i < cs->channels; ++i)
 223                 ++cs->bcs[i].use_count;
 224         spin_unlock_irqrestore(&cs->lock, flags);
 225
 226         gig_dbg(DEBUG_ANY, "allocated all channels");
 227
 228         return 1;
 229 }
 230
 231 void gigaset_free_channels(struct cardstate *cs)
 232 {
 233         unsigned long flags;
 234         int i;
 235
 236         gig_dbg(DEBUG_ANY, "unblocking all channels");
 237         spin_lock_irqsave(&cs->lock, flags);
 238         for (i = 0; i < cs->channels; ++i)
 239                 --cs->bcs[i].use_count;
 240         spin_unlock_irqrestore(&cs->lock, flags);
 241 }
 242
 243 void gigaset_block_channels(struct cardstate *cs)
 244 {
 245         unsigned long flags;
 246         int i;
 247
 248         gig_dbg(DEBUG_ANY, "blocking all channels");
 249         spin_lock_irqsave(&cs->lock, flags);
 250         for (i = 0; i < cs->channels; ++i)
 251                 ++cs->bcs[i].use_count;
 252         spin_unlock_irqrestore(&cs->lock, flags);
 253 }
 254
 255 static void clear_events(struct cardstate *cs)
 256 {
 257         struct event_t *ev;
 258         unsigned head, tail;
 259         unsigned long flags;
 260
 261         spin_lock_irqsave(&cs->ev_lock, flags);
 262
 263         head = cs->ev_head;
 264         tail = cs->ev_tail;
 265
 266         while (tail != head) {
 267                 ev = cs->events + head;
 268                 kfree(ev->ptr);
 269                 head = (head + 1) % MAX_EVENTS;
 270         }
 271
 272         cs->ev_head = tail;
 273
 274         spin_unlock_irqrestore(&cs->ev_lock, flags);
 275 }
 276
 277 struct event_t *gigaset_add_event(struct cardstate *cs,
 278                                   struct at_state_t *at_state, int type,
 279                                   void *ptr, int parameter, void *arg)
 280 {
 281         unsigned long flags;
 282         unsigned next, tail;
 283         struct event_t *event = NULL;
 284
 285         spin_lock_irqsave(&cs->ev_lock, flags);
 286
 287         tail = cs->ev_tail;
 288         next = (tail + 1) % MAX_EVENTS;
 289         if (unlikely(next == cs->ev_head))
 290                 err("event queue full");
 291         else {
 292                 event = cs->events + tail;
 293                 event->type = type;
 294                 event->at_state = at_state;
 295                 event->cid = -1;
 296                 event->ptr = ptr;
 297                 event->arg = arg;
 298                 event->parameter = parameter;
 299                 cs->ev_tail = next;
 300         }
 301
 302         spin_unlock_irqrestore(&cs->ev_lock, flags);
 303
 304         return event;
 305 }
 306 EXPORT_SYMBOL_GPL(gigaset_add_event);
 307
 308 static void free_strings(struct at_state_t *at_state)
 309 {
 310         int i;
 311
 312         for (i = 0; i < STR_NUM; ++i) {
 313                 kfree(at_state->str_var[i]);
 314                 at_state->str_var[i] = NULL;
 315         }
 316 }
 317
 318 static void clear_at_state(struct at_state_t *at_state)
 319 {
 320         free_strings(at_state);
 321 }
 322
 323 static void dealloc_at_states(struct cardstate *cs)
 324 {
 325         struct at_state_t *cur, *next;
 326
 327         list_for_each_entry_safe(cur, next, &cs->temp_at_states, list) {
 328                 list_del(&cur->list);
 329                 free_strings(cur);
 330                 kfree(cur);
 331         }
 332 }
 333
 334 static void gigaset_freebcs(struct bc_state *bcs)
 335 {
 336         int i;
 337
 338         gig_dbg(DEBUG_INIT, "freeing bcs[%d]->hw", bcs->channel);
 339         if (!bcs->cs->ops->freebcshw(bcs)) {
 340                 gig_dbg(DEBUG_INIT, "failed");
 341         }
 342
 343         gig_dbg(DEBUG_INIT, "clearing bcs[%d]->at_state", bcs->channel);
 344         clear_at_state(&bcs->at_state);
 345         gig_dbg(DEBUG_INIT, "freeing bcs[%d]->skb", bcs->channel);
 346
 347         if (bcs->skb)
 348                 dev_kfree_skb(bcs->skb);
 349         for (i = 0; i < AT_NUM; ++i) {
 350                 kfree(bcs->commands[i]);
 351                 bcs->commands[i] = NULL;
 352         }
 353 }
 354
 355 static struct cardstate *alloc_cs(struct gigaset_driver *drv)
 356 {
 357         unsigned long flags;
 358         unsigned i;
 359         static struct cardstate *ret = NULL;
 360
 361         spin_lock_irqsave(&drv->lock, flags);
 362         for (i = 0; i < drv->minors; ++i) {
 363                 if (!(drv->flags[i] & VALID_MINOR)) {
 364                         drv->flags[i] = VALID_MINOR;
 365                         ret = drv->cs + i;
 366                 }
 367                 if (ret)
 368                         break;
 369         }
 370         spin_unlock_irqrestore(&drv->lock, flags);
 371         return ret;
 372 }
 373
 374 static void free_cs(struct cardstate *cs)
 375 {
 376         unsigned long flags;
 377         struct gigaset_driver *drv = cs->driver;
 378         spin_lock_irqsave(&drv->lock, flags);
 379         drv->flags[cs->minor_index] = 0;
 380         spin_unlock_irqrestore(&drv->lock, flags);
 381 }
 382
 383 static void make_valid(struct cardstate *cs, unsigned mask)
 384 {
 385         unsigned long flags;
 386         struct gigaset_driver *drv = cs->driver;
 387         spin_lock_irqsave(&drv->lock, flags);
 388         drv->flags[cs->minor_index] |= mask;
 389         spin_unlock_irqrestore(&drv->lock, flags);
 390 }
 391
 392 static void make_invalid(struct cardstate *cs, unsigned mask)
 393 {
 394         unsigned long flags;
 395         struct gigaset_driver *drv = cs->driver;
 396         spin_lock_irqsave(&drv->lock, flags);
 397         drv->flags[cs->minor_index] &= ~mask;
 398         spin_unlock_irqrestore(&drv->lock, flags);
 399 }
 400
 401 void gigaset_freecs(struct cardstate *cs)
 402 {
 403         int i;
 404         unsigned long flags;
 405
 406         if (!cs)
 407                 return;
 408
 409         mutex_lock(&cs->mutex);
 410
 411         if (!cs->bcs)
 412                 goto f_cs;
 413         if (!cs->inbuf)
 414                 goto f_bcs;
 415
 416         spin_lock_irqsave(&cs->lock, flags);
 417         cs->running = 0;
 418         spin_unlock_irqrestore(&cs->lock, flags); /* event handler and timer are
 419                                                      not rescheduled below */
 420
 421         tasklet_kill(&cs->event_tasklet);
 422         del_timer_sync(&cs->timer);
 423
 424         switch (cs->cs_init) {
 425         default:
 426                 /* clear device sysfs */
 427                 gigaset_free_dev_sysfs(cs);
 428
 429                 gigaset_if_free(cs);
 430
 431                 gig_dbg(DEBUG_INIT, "clearing hw");
 432                 cs->ops->freecshw(cs);
 433
 434                 //FIXME cmdbuf
 435
 436                 /* fall through */
 437         case 2: /* error in initcshw */
 438                 /* Deregister from LL */
 439                 make_invalid(cs, VALID_ID);
 440                 gig_dbg(DEBUG_INIT, "clearing iif");
 441                 gigaset_i4l_cmd(cs, ISDN_STAT_UNLOAD);
 442
 443                 /* fall through */
 444         case 1: /* error when regestering to LL */
 445                 gig_dbg(DEBUG_INIT, "clearing at_state");
 446                 clear_at_state(&cs->at_state);
 447                 dealloc_at_states(cs);
 448
 449                 /* fall through */
 450         case 0: /* error in one call to initbcs */
 451                 for (i = 0; i < cs->channels; ++i) {
 452                         gig_dbg(DEBUG_INIT, "clearing bcs[%d]", i);
 453                         gigaset_freebcs(cs->bcs + i);
 454                 }
 455
 456                 clear_events(cs);
 457                 gig_dbg(DEBUG_INIT, "freeing inbuf");
 458                 kfree(cs->inbuf);
 459         }
 460 f_bcs:  gig_dbg(DEBUG_INIT, "freeing bcs[]");
 461         kfree(cs->bcs);
 462 f_cs:   gig_dbg(DEBUG_INIT, "freeing cs");
 463         mutex_unlock(&cs->mutex);
 464         free_cs(cs);
 465 }
 466 EXPORT_SYMBOL_GPL(gigaset_freecs);
 467
 468 void gigaset_at_init(struct at_state_t *at_state, struct bc_state *bcs,
 469                      struct cardstate *cs, int cid)
 470 {
 471         int i;
 472
 473         INIT_LIST_HEAD(&at_state->list);
 474         at_state->waiting = 0;
 475         at_state->getstring = 0;
 476         at_state->pending_commands = 0;
 477         at_state->timer_expires = 0;
 478         at_state->timer_active = 0;
 479         at_state->timer_index = 0;
 480         at_state->seq_index = 0;
 481         at_state->ConState = 0;
 482         for (i = 0; i < STR_NUM; ++i)
 483                 at_state->str_var[i] = NULL;
 484         at_state->int_var[VAR_ZDLE] = 0;
 485         at_state->int_var[VAR_ZCTP] = -1;
 486         at_state->int_var[VAR_ZSAU] = ZSAU_NULL;
 487         at_state->cs = cs;
 488         at_state->bcs = bcs;
 489         at_state->cid = cid;
 490         if (!cid)
 491                 at_state->replystruct = cs->tabnocid;
 492         else
 493                 at_state->replystruct = cs->tabcid;
 494 }
 495
 496
 497 static void gigaset_inbuf_init(struct inbuf_t *inbuf, struct bc_state *bcs,
 498                                struct cardstate *cs, int inputstate)
 499 /* inbuf->read must be allocated before! */
 500 {
 501         atomic_set(&inbuf->head, 0);
 502         atomic_set(&inbuf->tail, 0);
 503         inbuf->cs = cs;
 504         inbuf->bcs = bcs; /*base driver: NULL*/
 505         inbuf->rcvbuf = NULL; //FIXME
 506         inbuf->inputstate = inputstate;
 507 }
 508
 509 /* append received bytes to inbuf */
 510 int gigaset_fill_inbuf(struct inbuf_t *inbuf, const unsigned char *src,
 511                        unsigned numbytes)
 512 {
 513         unsigned n, head, tail, bytesleft;
 514
 515         gig_dbg(DEBUG_INTR, "received %u bytes", numbytes);
 516
 517         if (!numbytes)
 518                 return 0;
 519
 520         bytesleft = numbytes;
 521         tail = atomic_read(&inbuf->tail);
 522         head = atomic_read(&inbuf->head);
 523         gig_dbg(DEBUG_INTR, "buffer state: %u -> %u", head, tail);
 524
 525         while (bytesleft) {
 526                 if (head > tail)
 527                         n = head - 1 - tail;
 528                 else if (head == 0)
 529                         n = (RBUFSIZE-1) - tail;
 530                 else
 531                         n = RBUFSIZE - tail;
 532                 if (!n) {
 533                         dev_err(inbuf->cs->dev,
 534                                 "buffer overflow (%u bytes lost)", bytesleft);
 535                         break;
 536                 }
 537                 if (n > bytesleft)
 538                         n = bytesleft;
 539                 memcpy(inbuf->data + tail, src, n);
 540                 bytesleft -= n;
 541                 tail = (tail + n) % RBUFSIZE;
 542                 src += n;
 543         }
 544         gig_dbg(DEBUG_INTR, "setting tail to %u", tail);
 545         atomic_set(&inbuf->tail, tail);
 546         return numbytes != bytesleft;
 547 }
 548 EXPORT_SYMBOL_GPL(gigaset_fill_inbuf);
 549
 550 /* Initialize the b-channel structure */
 551 static struct bc_state *gigaset_initbcs(struct bc_state *bcs,
 552                                         struct cardstate *cs, int channel)
 553 {
 554         int i;
 555
 556         bcs->tx_skb = NULL; //FIXME -> hw part
 557
 558         skb_queue_head_init(&bcs->squeue);
 559
 560         bcs->corrupted = 0;
 561         bcs->trans_down = 0;
 562         bcs->trans_up = 0;
 563
 564         gig_dbg(DEBUG_INIT, "setting up bcs[%d]->at_state", channel);
 565         gigaset_at_init(&bcs->at_state, bcs, cs, -1);
 566
 567         bcs->rcvbytes = 0;
 568
 569 #ifdef CONFIG_GIGASET_DEBUG
 570         bcs->emptycount = 0;
 571 #endif
 572
 573         gig_dbg(DEBUG_INIT, "allocating bcs[%d]->skb", channel);
 574         bcs->fcs = PPP_INITFCS;
 575         bcs->inputstate = 0;
 576         if (cs->ignoreframes) {
 577                 bcs->inputstate |= INS_skip_frame;
 578                 bcs->skb = NULL;
 579         } else if ((bcs->skb = dev_alloc_skb(SBUFSIZE + HW_HDR_LEN)) != NULL)
 580                 skb_reserve(bcs->skb, HW_HDR_LEN);
 581         else {
 582                 warn("could not allocate skb\n");
 583                 bcs->inputstate |= INS_skip_frame;
 584         }
 585
 586         bcs->channel = channel;
 587         bcs->cs = cs;
 588
 589         bcs->chstate = 0;
 590         bcs->use_count = 1;
 591         bcs->busy = 0;
 592         bcs->ignore = cs->ignoreframes;
 593
 594         for (i = 0; i < AT_NUM; ++i)
 595                 bcs->commands[i] = NULL;
 596
 597         gig_dbg(DEBUG_INIT, "  setting up bcs[%d]->hw", channel);
 598         if (cs->ops->initbcshw(bcs))
 599                 return bcs;
 600
 601         gig_dbg(DEBUG_INIT, "  failed");
 602
 603         gig_dbg(DEBUG_INIT, "  freeing bcs[%d]->skb", channel);
 604         if (bcs->skb)
 605                 dev_kfree_skb(bcs->skb);
 606
 607         return NULL;
 608 }
 609
 610 /* gigaset_initcs
 611  * Allocate and initialize cardstate structure for Gigaset driver
 612  * Calls hardware dependent gigaset_initcshw() function
 613  * Calls B channel initialization function gigaset_initbcs() for each B channel
 614  * parameters:
 615  *      drv             hardware driver the device belongs to
 616  *      channels        number of B channels supported by device
 617  *      onechannel      !=0: B channel data and AT commands share one
 618  *                           communication channel
 619  *                      ==0: B channels have separate communication channels
 620  *      ignoreframes    number of frames to ignore after setting up B channel
 621  *      cidmode         !=0: start in CallID mode
 622  *      modulename      name of driver module (used for I4L registration)
 623  * return value:
 624  *      pointer to cardstate structure
 625  */
 626 struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels,
 627                                  int onechannel, int ignoreframes,
 628                                  int cidmode, const char *modulename)
 629 {
 630         struct cardstate *cs = NULL;
 631         unsigned long flags;
 632         int i;
 633
 634         gig_dbg(DEBUG_INIT, "allocating cs");
 635         cs = alloc_cs(drv);
 636         if (!cs)
 637                 goto error;
 638         gig_dbg(DEBUG_INIT, "allocating bcs[0..%d]", channels - 1);
 639         cs->bcs = kmalloc(channels * sizeof(struct bc_state), GFP_KERNEL);
 640         if (!cs->bcs)
 641                 goto error;
 642         gig_dbg(DEBUG_INIT, "allocating inbuf");
 643         cs->inbuf = kmalloc(sizeof(struct inbuf_t), GFP_KERNEL);
 644         if (!cs->inbuf)
 645                 goto error;
 646
 647         cs->cs_init = 0;
 648         cs->channels = channels;
 649         cs->onechannel = onechannel;
 650         cs->ignoreframes = ignoreframes;
 651         INIT_LIST_HEAD(&cs->temp_at_states);
 652         cs->running = 0;
 653         init_timer(&cs->timer); /* clear next & prev */
 654         spin_lock_init(&cs->ev_lock);
 655         cs->ev_tail = 0;
 656         cs->ev_head = 0;
 657         mutex_init(&cs->mutex);
 658         mutex_lock(&cs->mutex);
 659
 660         tasklet_init(&cs->event_tasklet, &gigaset_handle_event,
 661                      (unsigned long) cs);
 662         atomic_set(&cs->commands_pending, 0);
 663         cs->cur_at_seq = 0;
 664         cs->gotfwver = -1;
 665         cs->open_count = 0;
 666         cs->dev = NULL;
 667         cs->tty = NULL;
 668         cs->tty_dev = NULL;
 669         cs->cidmode = cidmode != 0;
 670
 671         //if(onechannel) { //FIXME
 672                 cs->tabnocid = gigaset_tab_nocid_m10x;
 673                 cs->tabcid = gigaset_tab_cid_m10x;
 674         //} else {
 675         //      cs->tabnocid = gigaset_tab_nocid;
 676         //      cs->tabcid = gigaset_tab_cid;
 677         //}
 678
 679         init_waitqueue_head(&cs->waitqueue);
 680         cs->waiting = 0;
 681
 682         atomic_set(&cs->mode, M_UNKNOWN);
 683         atomic_set(&cs->mstate, MS_UNINITIALIZED);
 684
 685         for (i = 0; i < channels; ++i) {
 686                 gig_dbg(DEBUG_INIT, "setting up bcs[%d].read", i);
 687                 if (!gigaset_initbcs(cs->bcs + i, cs, i))
 688                         goto error;
 689         }
 690
 691         ++cs->cs_init;
 692
 693         gig_dbg(DEBUG_INIT, "setting up at_state");
 694         spin_lock_init(&cs->lock);
 695         gigaset_at_init(&cs->at_state, NULL, cs, 0);
 696         cs->dle = 0;
 697         cs->cbytes = 0;
 698
 699         gig_dbg(DEBUG_INIT, "setting up inbuf");
 700         if (onechannel) {                       //FIXME distinction necessary?
 701                 gigaset_inbuf_init(cs->inbuf, cs->bcs, cs, INS_command);
 702         } else
 703                 gigaset_inbuf_init(cs->inbuf, NULL,    cs, INS_command);
 704
 705         cs->connected = 0;
 706         cs->isdn_up = 0;
 707
 708         gig_dbg(DEBUG_INIT, "setting up cmdbuf");
 709         cs->cmdbuf = cs->lastcmdbuf = NULL;
 710         spin_lock_init(&cs->cmdlock);
 711         cs->curlen = 0;
 712         cs->cmdbytes = 0;
 713
 714         gig_dbg(DEBUG_INIT, "setting up iif");
 715         if (!gigaset_register_to_LL(cs, modulename)) {
 716                 err("register_isdn failed");
 717                 goto error;
 718         }
 719
 720         make_valid(cs, VALID_ID);
 721         ++cs->cs_init;
 722         gig_dbg(DEBUG_INIT, "setting up hw");
 723         if (!cs->ops->initcshw(cs))
 724                 goto error;
 725
 726         ++cs->cs_init;
 727
 728         gigaset_if_init(cs);
 729
 730         /* set up device sysfs */
 731         gigaset_init_dev_sysfs(cs);
 732
 733         spin_lock_irqsave(&cs->lock, flags);
 734         cs->running = 1;
 735         spin_unlock_irqrestore(&cs->lock, flags);
 736         setup_timer(&cs->timer, timer_tick, (unsigned long) cs);
 737         cs->timer.expires = jiffies + msecs_to_jiffies(GIG_TICK);
 738         /* FIXME: can jiffies increase too much until the timer is added?
 739          * Same problem(?) with mod_timer() in timer_tick(). */
 740         add_timer(&cs->timer);
 741
 742         gig_dbg(DEBUG_INIT, "cs initialized");
 743         mutex_unlock(&cs->mutex);
 744         return cs;
 745
 746 error:  if (cs)
 747                 mutex_unlock(&cs->mutex);
 748         gig_dbg(DEBUG_INIT, "failed");
 749         gigaset_freecs(cs);
 750         return NULL;
 751 }
 752 EXPORT_SYMBOL_GPL(gigaset_initcs);
 753
 754 /* ReInitialize the b-channel structure on hangup */
 755 void gigaset_bcs_reinit(struct bc_state *bcs)
 756 {
 757         struct sk_buff *skb;
 758         struct cardstate *cs = bcs->cs;
 759         unsigned long flags;
 760
 761         while ((skb = skb_dequeue(&bcs->squeue)) != NULL)
 762                 dev_kfree_skb(skb);
 763
 764         spin_lock_irqsave(&cs->lock, flags);
 765         clear_at_state(&bcs->at_state);
 766         bcs->at_state.ConState = 0;
 767         bcs->at_state.timer_active = 0;
 768         bcs->at_state.timer_expires = 0;
 769         bcs->at_state.cid = -1;                 /* No CID defined */
 770         spin_unlock_irqrestore(&cs->lock, flags);
 771
 772         bcs->inputstate = 0;
 773
 774 #ifdef CONFIG_GIGASET_DEBUG
 775         bcs->emptycount = 0;
 776 #endif
 777
 778         bcs->fcs = PPP_INITFCS;
 779         bcs->chstate = 0;
 780
 781         bcs->ignore = cs->ignoreframes;
 782         if (bcs->ignore)
 783                 bcs->inputstate |= INS_skip_frame;
 784
 785
 786         cs->ops->reinitbcshw(bcs);
 787 }
 788
 789 static void cleanup_cs(struct cardstate *cs)
 790 {
 791         struct cmdbuf_t *cb, *tcb;
 792         int i;
 793         unsigned long flags;
 794
 795         spin_lock_irqsave(&cs->lock, flags);
 796
 797         atomic_set(&cs->mode, M_UNKNOWN);
 798         atomic_set(&cs->mstate, MS_UNINITIALIZED);
 799
 800         clear_at_state(&cs->at_state);
 801         dealloc_at_states(cs);
 802         free_strings(&cs->at_state);
 803         gigaset_at_init(&cs->at_state, NULL, cs, 0);
 804
 805         kfree(cs->inbuf->rcvbuf);
 806         cs->inbuf->rcvbuf = NULL;
 807         cs->inbuf->inputstate = INS_command;
 808         atomic_set(&cs->inbuf->head, 0);
 809         atomic_set(&cs->inbuf->tail, 0);
 810
 811         cb = cs->cmdbuf;
 812         while (cb) {
 813                 tcb = cb;
 814                 cb = cb->next;
 815                 kfree(tcb);
 816         }
 817         cs->cmdbuf = cs->lastcmdbuf = NULL;
 818         cs->curlen = 0;
 819         cs->cmdbytes = 0;
 820         cs->gotfwver = -1;
 821         cs->dle = 0;
 822         cs->cur_at_seq = 0;
 823         atomic_set(&cs->commands_pending, 0);
 824         cs->cbytes = 0;
 825
 826         spin_unlock_irqrestore(&cs->lock, flags);
 827
 828         for (i = 0; i < cs->channels; ++i) {
 829                 gigaset_freebcs(cs->bcs + i);
 830                 if (!gigaset_initbcs(cs->bcs + i, cs, i))
 831                         break;                  //FIXME error handling
 832         }
 833
 834         if (cs->waiting) {
 835                 cs->cmd_result = -ENODEV;
 836                 cs->waiting = 0;
 837                 wake_up_interruptible(&cs->waitqueue);
 838         }
 839 }
 840
 841
 842 int gigaset_start(struct cardstate *cs)
 843 {
 844         unsigned long flags;
 845
 846         if (mutex_lock_interruptible(&cs->mutex))
 847                 return 0;
 848
 849         spin_lock_irqsave(&cs->lock, flags);
 850         cs->connected = 1;
 851         spin_unlock_irqrestore(&cs->lock, flags);
 852
 853         if (atomic_read(&cs->mstate) != MS_LOCKED) {
 854                 cs->ops->set_modem_ctrl(cs, 0, TIOCM_DTR|TIOCM_RTS);
 855                 cs->ops->baud_rate(cs, B115200);
 856                 cs->ops->set_line_ctrl(cs, CS8);
 857                 cs->control_state = TIOCM_DTR|TIOCM_RTS;
 858         } else {
 859                 //FIXME use some saved values?
 860         }
 861
 862         cs->waiting = 1;
 863
 864         if (!gigaset_add_event(cs, &cs->at_state, EV_START, NULL, 0, NULL)) {
 865                 cs->waiting = 0;
 866                 //FIXME what should we do?
 867                 goto error;
 868         }
 869
 870         gig_dbg(DEBUG_CMD, "scheduling START");
 871         gigaset_schedule_event(cs);
 872
 873         wait_event(cs->waitqueue, !cs->waiting);
 874
 875         mutex_unlock(&cs->mutex);
 876         return 1;
 877
 878 error:
 879         mutex_unlock(&cs->mutex);
 880         return 0;
 881 }
 882 EXPORT_SYMBOL_GPL(gigaset_start);
 883
 884 void gigaset_shutdown(struct cardstate *cs)
 885 {
 886         mutex_lock(&cs->mutex);
 887
 888         cs->waiting = 1;
 889
 890         if (!gigaset_add_event(cs, &cs->at_state, EV_SHUTDOWN, NULL, 0, NULL)) {
 891                 //FIXME what should we do?
 892                 goto exit;
 893         }
 894
 895         gig_dbg(DEBUG_CMD, "scheduling SHUTDOWN");
 896         gigaset_schedule_event(cs);
 897
 898         if (wait_event_interruptible(cs->waitqueue, !cs->waiting)) {
 899                 warn("%s: aborted", __func__);
 900                 //FIXME
 901         }
 902
 903         if (atomic_read(&cs->mstate) != MS_LOCKED) {
 904                 //FIXME?
 905                 //gigaset_baud_rate(cs, B115200);
 906                 //gigaset_set_line_ctrl(cs, CS8);
 907                 //gigaset_set_modem_ctrl(cs, TIOCM_DTR|TIOCM_RTS, 0);
 908                 //cs->control_state = 0;
 909         } else {
 910                 //FIXME use some saved values?
 911         }
 912
 913         cleanup_cs(cs);
 914
 915 exit:
 916         mutex_unlock(&cs->mutex);
 917 }
 918 EXPORT_SYMBOL_GPL(gigaset_shutdown);
 919
 920 void gigaset_stop(struct cardstate *cs)
 921 {
 922         mutex_lock(&cs->mutex);
 923
 924         cs->waiting = 1;
 925
 926         if (!gigaset_add_event(cs, &cs->at_state, EV_STOP, NULL, 0, NULL)) {
 927                 //FIXME what should we do?
 928                 goto exit;
 929         }
 930
 931         gig_dbg(DEBUG_CMD, "scheduling STOP");
 932         gigaset_schedule_event(cs);
 933
 934         if (wait_event_interruptible(cs->waitqueue, !cs->waiting)) {
 935                 warn("%s: aborted", __func__);
 936                 //FIXME
 937         }
 938
 939         cleanup_cs(cs);
 940
 941 exit:
 942         mutex_unlock(&cs->mutex);
 943 }
 944 EXPORT_SYMBOL_GPL(gigaset_stop);
 945
 946 static LIST_HEAD(drivers);
 947 static DEFINE_SPINLOCK(driver_lock);
 948
 949 struct cardstate *gigaset_get_cs_by_id(int id)
 950 {
 951         unsigned long flags;
 952         static struct cardstate *ret = NULL;
 953         static struct cardstate *cs;
 954         struct gigaset_driver *drv;
 955         unsigned i;
 956
 957         spin_lock_irqsave(&driver_lock, flags);
 958         list_for_each_entry(drv, &drivers, list) {
 959                 spin_lock(&drv->lock);
 960                 for (i = 0; i < drv->minors; ++i) {
 961                         if (drv->flags[i] & VALID_ID) {
 962                                 cs = drv->cs + i;
 963                                 if (cs->myid == id)
 964                                         ret = cs;
 965                         }
 966                         if (ret)
 967                                 break;
 968                 }
 969                 spin_unlock(&drv->lock);
 970                 if (ret)
 971                         break;
 972         }
 973         spin_unlock_irqrestore(&driver_lock, flags);
 974         return ret;
 975 }
 976
 977 void gigaset_debugdrivers(void)
 978 {
 979         unsigned long flags;
 980         static struct cardstate *cs;
 981         struct gigaset_driver *drv;
 982         unsigned i;
 983
 984         spin_lock_irqsave(&driver_lock, flags);
 985         list_for_each_entry(drv, &drivers, list) {
 986                 gig_dbg(DEBUG_DRIVER, "driver %p", drv);
 987                 spin_lock(&drv->lock);
 988                 for (i = 0; i < drv->minors; ++i) {
 989                         gig_dbg(DEBUG_DRIVER, "  index %u", i);
 990                         gig_dbg(DEBUG_DRIVER, "    flags 0x%02x",
 991                                 drv->flags[i]);
 992                         cs = drv->cs + i;
 993                         gig_dbg(DEBUG_DRIVER, "    cardstate %p", cs);
 994                         gig_dbg(DEBUG_DRIVER, "    minor_index %u",
 995                                 cs->minor_index);
 996                         gig_dbg(DEBUG_DRIVER, "    driver %p", cs->driver);
 997                         gig_dbg(DEBUG_DRIVER, "    i4l id %d", cs->myid);
 998                 }
 999                 spin_unlock(&drv->lock);
1000         }
1001         spin_unlock_irqrestore(&driver_lock, flags);
1002 }
1003
1004 static struct cardstate *gigaset_get_cs_by_minor(unsigned minor)
1005 {
1006         unsigned long flags;
1007         static struct cardstate *ret = NULL;
1008         struct gigaset_driver *drv;
1009         unsigned index;
1010
1011         spin_lock_irqsave(&driver_lock, flags);
1012         list_for_each_entry(drv, &drivers, list) {
1013                 if (minor < drv->minor || minor >= drv->minor + drv->minors)
1014                         continue;
1015                 index = minor - drv->minor;
1016                 spin_lock(&drv->lock);
1017                 if (drv->flags[index] & VALID_MINOR)
1018                         ret = drv->cs + index;
1019                 spin_unlock(&drv->lock);
1020                 if (ret)
1021                         break;
1022         }
1023         spin_unlock_irqrestore(&driver_lock, flags);
1024         return ret;
1025 }
1026
1027 struct cardstate *gigaset_get_cs_by_tty(struct tty_struct *tty)
1028 {
1029         if (tty->index < 0 || tty->index >= tty->driver->num)
1030                 return NULL;
1031         return gigaset_get_cs_by_minor(tty->index + tty->driver->minor_start);
1032 }
1033
1034 void gigaset_freedriver(struct gigaset_driver *drv)
1035 {
1036         unsigned long flags;
1037
1038         spin_lock_irqsave(&driver_lock, flags);
1039         list_del(&drv->list);
1040         spin_unlock_irqrestore(&driver_lock, flags);
1041
1042         gigaset_if_freedriver(drv);
1043         module_put(drv->owner);
1044
1045         kfree(drv->cs);
1046         kfree(drv->flags);
1047         kfree(drv);
1048 }
1049 EXPORT_SYMBOL_GPL(gigaset_freedriver);
1050
1051 /* gigaset_initdriver
1052  * Allocate and initialize gigaset_driver structure. Initialize interface.
1053  * parameters:
1054  *      minor           First minor number
1055  *      minors          Number of minors this driver can handle
1056  *      procname        Name of the driver
1057  *      devname         Name of the device files (prefix without minor number)
1058  * return value:
1059  *      Pointer to the gigaset_driver structure on success, NULL on failure.
1060  */
1061 struct gigaset_driver *gigaset_initdriver(unsigned minor, unsigned minors,
1062                                           const char *procname,
1063                                           const char *devname,
1064                                           const struct gigaset_ops *ops,
1065                                           struct module *owner)
1066 {
1067         struct gigaset_driver *drv;
1068         unsigned long flags;
1069         unsigned i;
1070
1071         drv = kmalloc(sizeof *drv, GFP_KERNEL);
1072         if (!drv)
1073                 return NULL;
1074
1075         if (!try_module_get(owner))
1076                 goto out1;
1077
1078         drv->cs = NULL;
1079         drv->have_tty = 0;
1080         drv->minor = minor;
1081         drv->minors = minors;
1082         spin_lock_init(&drv->lock);
1083         drv->blocked = 0;
1084         drv->ops = ops;
1085         drv->owner = owner;
1086         INIT_LIST_HEAD(&drv->list);
1087
1088         drv->cs = kmalloc(minors * sizeof *drv->cs, GFP_KERNEL);
1089         if (!drv->cs)
1090                 goto out2;
1091
1092         drv->flags = kmalloc(minors * sizeof *drv->flags, GFP_KERNEL);
1093         if (!drv->flags)
1094                 goto out3;
1095
1096         for (i = 0; i < minors; ++i) {
1097                 drv->flags[i] = 0;
1098                 drv->cs[i].driver = drv;
1099                 drv->cs[i].ops = drv->ops;
1100                 drv->cs[i].minor_index = i;
1101         }
1102
1103         gigaset_if_initdriver(drv, procname, devname);
1104
1105         spin_lock_irqsave(&driver_lock, flags);
1106         list_add(&drv->list, &drivers);
1107         spin_unlock_irqrestore(&driver_lock, flags);
1108
1109         return drv;
1110
1111 out3:
1112         kfree(drv->cs);
1113 out2:
1114         module_put(owner);
1115 out1:
1116         kfree(drv);
1117         return NULL;
1118 }
1119 EXPORT_SYMBOL_GPL(gigaset_initdriver);
1120
1121 /* For drivers without fixed assignment device<->cardstate (usb) */
1122 struct cardstate *gigaset_getunassignedcs(struct gigaset_driver *drv)
1123 {
1124         unsigned long flags;
1125         struct cardstate *cs = NULL;
1126         unsigned i;
1127
1128         spin_lock_irqsave(&drv->lock, flags);
1129         if (drv->blocked)
1130                 goto exit;
1131         for (i = 0; i < drv->minors; ++i) {
1132                 if ((drv->flags[i] & VALID_MINOR) &&
1133                     !(drv->flags[i] & ASSIGNED)) {
1134                         drv->flags[i] |= ASSIGNED;
1135                         cs = drv->cs + i;
1136                         break;
1137                 }
1138         }
1139 exit:
1140         spin_unlock_irqrestore(&drv->lock, flags);
1141         return cs;
1142 }
1143 EXPORT_SYMBOL_GPL(gigaset_getunassignedcs);
1144
1145 void gigaset_unassign(struct cardstate *cs)
1146 {
1147         unsigned long flags;
1148         unsigned *minor_flags;
1149         struct gigaset_driver *drv;
1150
1151         if (!cs)
1152                 return;
1153         drv = cs->driver;
1154         spin_lock_irqsave(&drv->lock, flags);
1155         minor_flags = drv->flags + cs->minor_index;
1156         if (*minor_flags & VALID_MINOR)
1157                 *minor_flags &= ~ASSIGNED;
1158         spin_unlock_irqrestore(&drv->lock, flags);
1159 }
1160 EXPORT_SYMBOL_GPL(gigaset_unassign);
1161
1162 void gigaset_blockdriver(struct gigaset_driver *drv)
1163 {
1164         unsigned long flags;
1165         spin_lock_irqsave(&drv->lock, flags);
1166         drv->blocked = 1;
1167         spin_unlock_irqrestore(&drv->lock, flags);
1168 }
1169 EXPORT_SYMBOL_GPL(gigaset_blockdriver);
1170
1171 static int __init gigaset_init_module(void)
1172 {
1173         /* in accordance with the principle of least astonishment,
1174          * setting the 'debug' parameter to 1 activates a sensible
1175          * set of default debug levels
1176          */
1177         if (gigaset_debuglevel == 1)
1178                 gigaset_debuglevel = DEBUG_DEFAULT;
1179
1180         info(DRIVER_AUTHOR);
1181         info(DRIVER_DESC);
1182         return 0;
1183 }
1184
1185 static void __exit gigaset_exit_module(void)
1186 {
1187 }
1188
1189 module_init(gigaset_init_module);
1190 module_exit(gigaset_exit_module);
1191
1192 MODULE_AUTHOR(DRIVER_AUTHOR);
1193 MODULE_DESCRIPTION(DRIVER_DESC);
1194
1195 MODULE_LICENSE("GPL");